Circular sawing machine



oovloonobluwlwoao J. VAN PATTBN.

CIRCULAR SAWING MACHINE. Y

Patented Apr. 8, 1884.

i (No Model.)

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WITNESSBS higlrrnn Sterns ATWT trice.

Joan van narran, or EAST TAwAs, MicHicAn.

CIRClJLAR SAWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 296,652, dated April 8, 1884.

Application tiled September 21, 1883. (No model.)

To al whom 25 may concern: Beit known that I, JOHN VAN PATTEN, a citizen of the United States, residing at East Tawas, in the county of losco and State of Michigan, have invented a new and useful Improvement in Circular Sewing Machines, oi' which the following is a specification.

My invention relates to that class of sawingmachines in which two ormore saws are employed to cut off or trim lumber to given lengths.

Lumber is frequently shaky and knotty, and saws are often dull, and when the two ends of a plank are being sawed off at the same time any such irregularity may prevent one end oi' the board from being fed as rapidly as the other end, thus cramping it between the saws, causing great danger to men and inachinery. From various causes the saws of a trimming-machine sometimes get out of parallel, and are then dangerous to use.

The object of my invention is to overcome these and other objectionsto many sawing machines now in use.

To this end my invention consists in certain means whereby the two ends of a plank or other piece of lumber may be sawed off in succession, means whereby the saw-frames may be adjusted to align the saws, means whereby the diii'erent saw-frames may be held np while their saws are at work, and whereby the throwing up of one frame will cause the others to-i'all, as hereinafter described and claimed, reference being had to the accompanying drawings, in which- Figure l is a transverse vertical section, part in elevation, oi' my sawing-machine, and Fig. 2 is a plan view of the same.

A represents the frame of the machine, which is made of timbers in the usual manner, the front'or worklnans side being to the left.

B B are saws mounted on arbore C, which are journaled in bearings D, rigidly bolted to frames E. `Arbors C are provided with beltpulleys F. The timbers of frame E are secured together to make each frame a rigid unit. There may he any desired number of these saws B and frames E hung to swing on a rod, G. INhen the saw and frame are in the position shown in dotted lines, the saw is out' of position for work, and it is held up in the position for work (shown in full lines) by means of a latch, H, secured upon rod I, which latch` falls of its own weight beneath the end of frame E when raised, and serves as a rigid brace to support the frame and saw. All the latches H are rigidly secured upon the same rod, I, by set-screws J, by which means said latches are all set to engage their respective frames at the same instant, and there is a face, K, on each latch, whose lower edge is as near or nearer to the axis G of frame E than the upper edge of said face. By this means, when any frame is raised, it bears against the face K of its latch, thus swinging all the latches back out of engagement with any frame previously raised, and allowing said frames to swing down out ofthe way of work and ofthe latches, and permitting thev latch to engage the last frame when raised high enough. It is common to align the saws by moving their arbor bearings along the frame and afterward securing them. This method is objectionable, because it is very difficult to reset the two bearings at the Opposite ends of the same arbor exactly in line, and when again bolted down the bearings are likely to bind on the arbor.

Others have to some extent obyiated this objection by means of a pair of bearings .for each arbor, cast in one iron frame, and the whole frame adapted to be moved for aligning its saw. This method of hanging saws is expensive, and the iron frame is in the way 0f managing the belt, and sometimes direct-ly interferes with running the belt in the direction desired. I have therefore devised the following means for aligning the saw: I hang one side oftheirame E by means of a transverse# ly-adjustable box or block, L, on rod G1. I hang the other side by a common box-bearing having bolt-holes large enough to move freely when the screws are loosened. The box L is lit-ted to slide in a frame, M, which is hired to frame E, and it is adjusted in said frame M by means of set-screws N. By. this means the whole frame E is adjusted to align the saws, and the saw-bearings are in no way affected thereby. It doesV not matter if the framebearings do bind a little on rod G, for there is no motion of the frame on this rod whenV the saw is in use. 'Ihe swinging movement ofthe ICI) 1 trimmed. By this means I adapt my sawingfraine on this rod is only to throw the saw into and out of position for use.

P is a saw for trimming the opposite end of the plank. This saw is permanently journaled in bearings on the main frame A, ahead of thel rank of the other saws. B, to an extent equal to the eXtreme width of any board to be machine to cut first one end and then the other end of the same plank at one continuous move ofthe plank across the saw-bench. This motion is produced by the usual toothed feedchains, Q, running upon intermittently-moving sprocket-wheels, R. The starting or stopping of these wheels I accomplish by means of friction-clutches between the rst pulley, R, and its drive-shaft S, thus giving an easier motion to the feed-chains, and one less wearing to the machinery.

The single saw P may of course be set out of line of the other saws, B, to the rear of their rank as well as to the front, so that either end of the lumber may be sawed first. The

frame E may bea solid casting.

That I claim as my invention, and wish to secure by Letters Patent, isv l. The combination, with a series of circulan. saw frames hung at one end to swing vertically, of a corresponding series of bracinglatches adapted to engage and hold said frames raised, one rock-shaft supporting all of said latches, setscrews in said latches for adjusting them on said shaft, and the front of each latch provided with a face, K, as and for the purpose specied.

2. A series of frames having circular saws mounted thereon by means of bearings fixed Y on said frames, in combination with box-beary ings adjustably secured to said frames, and a rod or rods for the same to swing on, and means for adjusting said box-bearings on said swinging frames, whereby the several saws may be aligned relative to each other, as described.

' JOHN VAN PATTEN.

Witnesses:

W. M. LocKE, NELSON SiMs. 

